Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Schedule of Segment Reporting Information, by Segment (Details)

v3.19.1
Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Operating Revenues $ 56,249 $ 51,721  
Direct Costs and Expenses 44,277 38,348  
Direct Vessel (Loss) Profit 11,972 13,373  
Lease expense 3,931 2,825  
Administrative and general (1) 12,217 [1] 12,807 [2]  
Depreciation and amortization 17,193 19,512  
Other Costs and Expenses 33,341 35,144  
Gains (Losses) on Asset Dispositions and Impairments, Net 359 (2,643)  
Operating Loss (21,010) (24,414)  
Historical cost 1,294,945 1,320,496 $ 1,242,733
Accumulated depreciation (579,441) (580,461) (561,272)
Property and equipment 715,504 740,035 $ 681,461
Total Assets 1,019,009 [3] 987,675 [4]  
Time Charter      
Segment Reporting Information [Line Items]      
Operating Revenues 52,127 47,142  
Bareboat Charter      
Segment Reporting Information [Line Items]      
Operating Revenues 1,143 1,143  
Other Marine Services      
Segment Reporting Information [Line Items]      
Operating Revenues 2,979    
Personnel      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 22,756 21,676  
Repairs and Maintenance      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 9,006 7,073  
Drydocking      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 2,879 2,257  
Insurance and Loss Reserves      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 1,474 1,190  
Fuel, Lubes and Supplies      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 3,753 3,545  
Other Direct Costs and Expenses      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 4,409 2,607  
Other      
Segment Reporting Information [Line Items]      
Operating Revenues   3,436  
UNITED STATES      
Segment Reporting Information [Line Items]      
Operating Revenues 9,137 7,637  
Direct Costs and Expenses 10,640 6,163  
Direct Vessel (Loss) Profit (1,503) 1,474  
Lease expense 2,897 1,862  
Depreciation and amortization 5,498 6,535  
Historical cost 416,559 526,986  
Accumulated depreciation (223,720) (236,120)  
Property and equipment 192,839 290,866  
Total Assets 330,938 [3] 423,328 [4]  
UNITED STATES | Time Charter      
Segment Reporting Information [Line Items]      
Operating Revenues 8,005 5,982  
UNITED STATES | Other Marine Services      
Segment Reporting Information [Line Items]      
Operating Revenues 1,132    
UNITED STATES | Personnel      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 4,503 3,992  
UNITED STATES | Repairs and Maintenance      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 2,778 694  
UNITED STATES | Drydocking      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 1,994 525  
UNITED STATES | Insurance and Loss Reserves      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 592 434  
UNITED STATES | Fuel, Lubes and Supplies      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 683 493  
UNITED STATES | Other Direct Costs and Expenses      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 90 25  
UNITED STATES | Other      
Segment Reporting Information [Line Items]      
Operating Revenues   1,655  
Africa      
Segment Reporting Information [Line Items]      
Operating Revenues 10,136 12,081  
Direct Costs and Expenses 8,462 7,354  
Direct Vessel (Loss) Profit 1,674 4,727  
Lease expense 665 963  
Depreciation and amortization 2,356 2,807  
Historical cost 207,167 168,317  
Accumulated depreciation (59,652) (54,349)  
Property and equipment 147,515 113,968  
Total Assets 160,624 [3] 117,298 [4]  
Africa | Time Charter      
Segment Reporting Information [Line Items]      
Operating Revenues 10,773 10,794  
Africa | Other Marine Services      
Segment Reporting Information [Line Items]      
Operating Revenues (637)    
Africa | Personnel      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 3,867 4,073  
Africa | Repairs and Maintenance      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 1,184 1,356  
Africa | Drydocking      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 338 2  
Africa | Insurance and Loss Reserves      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 213 218  
Africa | Fuel, Lubes and Supplies      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 754 669  
Africa | Other Direct Costs and Expenses      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 2,106 1,036  
Africa | Other      
Segment Reporting Information [Line Items]      
Operating Revenues   1,287  
Middle East and Asia [Member]      
Segment Reporting Information [Line Items]      
Operating Revenues 12,727 11,244  
Direct Costs and Expenses 8,742 8,917  
Direct Vessel (Loss) Profit 3,985 2,327  
Lease expense 6    
Depreciation and amortization 4,249 6,090  
Historical cost 310,297 349,047  
Accumulated depreciation (85,627) (109,601)  
Property and equipment 224,670 239,446  
Total Assets 266,007 [3] 270,293 [4]  
Middle East and Asia [Member] | Time Charter      
Segment Reporting Information [Line Items]      
Operating Revenues 12,499 11,374  
Middle East and Asia [Member] | Other Marine Services      
Segment Reporting Information [Line Items]      
Operating Revenues 228    
Middle East and Asia [Member] | Personnel      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 4,254 4,022  
Middle East and Asia [Member] | Repairs and Maintenance      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 2,193 2,428  
Middle East and Asia [Member] | Drydocking      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 159 (11)  
Middle East and Asia [Member] | Insurance and Loss Reserves      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 327 236  
Middle East and Asia [Member] | Fuel, Lubes and Supplies      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 709 1,034  
Middle East and Asia [Member] | Other Direct Costs and Expenses      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 1,100 1,208  
Middle East and Asia [Member] | Other      
Segment Reporting Information [Line Items]      
Operating Revenues   (130)  
Latin America      
Segment Reporting Information [Line Items]      
Operating Revenues 6,700 2,627  
Direct Costs and Expenses 3,054 873  
Direct Vessel (Loss) Profit 3,646 1,754  
Lease expense 1    
Depreciation and amortization 1,936 1,219  
Historical cost 119,699 93,223  
Accumulated depreciation (60,444) (39,551)  
Property and equipment 59,255 53,672  
Total Assets 128,421 [3] 123,679 [4]  
Latin America | Time Charter      
Segment Reporting Information [Line Items]      
Operating Revenues 4,922 1,374  
Latin America | Bareboat Charter      
Segment Reporting Information [Line Items]      
Operating Revenues 1,143 1,143  
Latin America | Other Marine Services      
Segment Reporting Information [Line Items]      
Operating Revenues 635    
Latin America | Personnel      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 1,556 376  
Latin America | Repairs and Maintenance      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 335 305  
Latin America | Drydocking      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 79    
Latin America | Insurance and Loss Reserves      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 135 67  
Latin America | Fuel, Lubes and Supplies      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 428 65  
Latin America | Other Direct Costs and Expenses      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 521 60  
Latin America | Other      
Segment Reporting Information [Line Items]      
Operating Revenues   110  
Europe      
Segment Reporting Information [Line Items]      
Operating Revenues 17,549 18,132  
Direct Costs and Expenses 13,379 15,041  
Direct Vessel (Loss) Profit 4,170 3,091  
Lease expense 362    
Depreciation and amortization 3,154 2,861  
Historical cost 241,223 182,923  
Accumulated depreciation (149,998) (140,840)  
Property and equipment 91,225 42,083  
Total Assets 133,019 [3] 53,077 [4]  
Europe | Time Charter      
Segment Reporting Information [Line Items]      
Operating Revenues 15,928 17,618  
Europe | Other Marine Services      
Segment Reporting Information [Line Items]      
Operating Revenues 1,621    
Europe | Personnel      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 8,576 9,213  
Europe | Repairs and Maintenance      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 2,516 2,290  
Europe | Drydocking      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 309 1,741  
Europe | Insurance and Loss Reserves      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 207 235  
Europe | Fuel, Lubes and Supplies      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses 1,179 1,284  
Europe | Other Direct Costs and Expenses      
Segment Reporting Information [Line Items]      
Direct Costs and Expenses $ 592 278  
Europe | Other      
Segment Reporting Information [Line Items]      
Operating Revenues   $ 514  
[1] Includes $217 facility lease expense.
[2] Includes $433 facility lease expense.
[3] Total assets by region does not include corporate assets of $93,340 as of March 31, 2019.
[4] Total assets by region does not include corporate assets of $129,703 as of March 31, 2018